Clinton 323A Kullanım Kılavuzu ve Parça Listesi - Sayfa 3

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Sayfayı Yazdır
In
a two
cycle engine,
intake,
com-
pression,
power
and exhaust
are
com-
pleted
in two
strokes
of
the piston. A
power-stroke
results
with
every
revolu_
tion of the
crankshaft.
On the
Lrpward
stroke
of
the piston, a partial
vacuum
is created
in
the crankcase.
(See
Figure
No.
l)
First, the
vacuunt and outside air
pressure cause
the
reed valve
between
the
crankcase
and the
carburetor
to
open.
The air-fuel mixture from
the
carburetor
flows
in to
the
ensine
crankcase.
Then, the downward m6u"-
ment
of
the
piston
causes
the
reed
valve
to
close
while continued
down-
ward
movement
of
the
piston
com_
presses
the fuel charge
in
the
crank_
case.
Near the
bottom
of
its
stroke
the
piston
uncovers
the
intake
by-pass
port, which
connects
the
combirsiion
chamber and the
crankcase.
As the piston
moves
upward on
its
stroke,
it
passes
the
intake port, closins
the
port
opening. Its continued
,p*arj
movement
causes
the fuel mixture
in
the cylinder
to
be
compressed.
At
the
same
time a
new
fuel iharge is
drawn
into
the
crankcase.
As
the
iiston
nears
the top
of
the compression stroke,
the
fuel nrixture in
the-combustion
cham_
ber
is ignited by
the spark.
The
explo_
sron
and expansion
of
gases
forces'the
piston down
on
its
-power
stroke.
Power
is
not
delivered
for
the
full
length
of
the stroke.
Some
time is
re_
quired
to rid
the cylinder
of
burned
gases,
so that
it
may
receive
a
fresh
fuel
charge
l'ronr
the-
crankcase.
'
As
the
piston
nears
the bottom
of
its
stroke,
it
uncovers
the
exhaust
oort
opening slightly ahead
of
the
iniake
port. This
permits
taking
advantage
of
the.
pressure
of
the exharlst
gases
ii
the
cylinder, which
are
still
coirparatively
high,
and
allows
them
to start
escaoins.
Further
downward
travel
of
the
pisto"n
uncovers
the intake
by-pass
port.
The
incoming
charge
assists
in
forcing
the
exhaust
gases
out
of
the cylindei,
to
contplete
the
cycle.
'The
chief atfributes
of
the
two
cvcle
engine-
are
its lightweight,
low
cost
ind
powerful
but
simple operation. With
only three
basic
moving parts
(crank_
shaft, piston and rod)],'muirteninc"
costs
are at
a
minimum while efficiency
is
at
a maximum.
Figure
No.
2
cHArN
l
Slide
the
guide
bar over
the
mounting'studs
on the
reduction
housing
to
the
full
length
of
the
guide
bar slot.
(See
Figure No.
2)
Place
the chain around the
guide
bar
so
that cutting
edges
of
teeth
on
top
of
the
guide bar
point
away
fronr
the engine
unit.
Seat
the
Chipper Chain
drive
links
in
the
guide
bar
groove
then
over
the chain drive
sprocket.
Pull
the guide bar
out from
the
en-
gine unit until the chain slack
is
taken up. Make
sure
that
the chain
drive links
at
the bottom
of
the
bar
are
properly
seated
in
the bar
groove.
Place
the cover
strut on
mounting
studs
with
the smooth pad
against
the
guide
bar,
Make
sure
that the chain
tension
hook bolt. located
in
the
cover
strut, fits into
the guide
bar
slot.
7.
Place
the spike bumper over
the
studs
on the
reduction
housing
and
secure
with
nuts.
8.
Put
washers and
nuts
on
the
guide
bar mounting
studs
to
make
them
snug,
but not tight
against
the
guide
bar mounting
plate.
While holding with upward
pres-
sure
of
the finger
in
the hole
at
end
of
guide
bar, turn
tension
ad-
justing
screw
on the
hook
bolt
clockwise
until the
chain has
a
free
sag
of not
less
than 7e
inch
nor more lhan
Vt
inch from
the
bottom
of
the
guide
bar.
lf
the
blade
is not in the up position
as
high
as
it will
go against
the
guide
bar
studs,
it
will
cause
excessive
wear
on the top
of
the guide
bar
closest
to
the
sprocket.
Securely
tighten
the
mounting
stud nuts and then re-check for
proper chain tension.
If
the
ten-
sion has
changed,
then
loosen
the
mounting stud nuts and
repeat the
procedure
outlined
in
step
9.
Be
sure
the chain is properly
ten-
sioned
at all
times. Check
it
often.
A
chain that
is too tight rvill
in-
terfere
with
proper cuttin,s
and
rvill
cause serious damage
to
the
guide
bar
and the
engine.
CAU-
TION:
Check and
maintain
chain
tension
for
long
life
and best
oper-
ation.
Use
extra care
with a
new
chain
until the
stretch,
which
is
most noticeable
in
the first'
hour
of
cutting, is
eliminated.
9.
COMPRESSION
POWER
EXHAUST
Figure
No.
I
2.
3.
4.
10.
I
l.
5.
6.
CAUTION
-
]rlsysl Adjust
Chain
Tension
While
Engine
Is
Running.
5
4
ASSEMBLY OF
GUIDE BAR
AND
CHIPPER
CHAIN